/*头部样式*/
body,ul{
    margin: 0; padding: 0;
}

header{
    line-height: 45px;
    color: white;
    text-align: center;
    width: 100%;
    height: 45px;
    background-color: #b52221;
}
ul{
    width: 90%;
    margin: 0 auto 0 auto;
    
}
ul::after{
    content: "";
    display: block;
    clear: both;
}
ul li{
    list-style-type: none;
    float: left; 
    width: 33.3%;
    font-size: 0px;
    text-align: center;
}
ul li img{
    margin: 8px;
    box-shadow: 0 0 4px #000;
}
footer {
    margin-top: 10px;
    text-align: center;
}
